Heterostemma suberosum Costantin (1912: 124)

Rodda, Michele, 2016, Checklist and typification of Heterostemma (Apocynaceae, Asclepiadoideae, Ceropegieae), Phytotaxa 263 (1), pp. 1-17 : 12

Heterostemma suberosum Costantin (1912: 124)

TYPE:— VIETNAM, ‘moï: Bú tac’, September 186(?)5, Pierre s.n. (lectotype P [P00645992], here designated)

Notes: —The type of H. suberosum was indicated by Costantin (1912) as ‘Cochinchine: Song-lu (Pierre), Nom moï: Bú tac’. In P I have found two sheets, the first [P00645991] identified as H. suberosum in Costantin’s handwriting, collected by Pierre in Song Lu in March 1877. The other [P00645992] collected by Pierre in September 186(?)5 and is annotated ‘moï: Bú tac’. Both are suitable lectotypes, however, since [P00645991] is a leafless sterile specimen, [P00645992] is instead selected as lectotype as despite being sterile it has two complete leaves. An epitype will have to be selected to allow correct application of the name when Heterostemma is revised.